Don't Panic!

More features? Largely irrelevant. PL/1 has more features than either Cobol or Fortran (btw, the official name is Fortran; it hasn't been FORTRAN for about 20 years). I daresay there's considerably more new code being written in either than in PL/1.

More features can just as easily make a language too complex to use or make writing compilers too difficult (Algol-68, anyone?).

Will Perl be superseded by a better (note that "better" is not congruent with "more features") language? Eventually. Perl 6 is an evolutionary improvement over Perl 5, and will eventually replace it. Perl is still young; people have been writing Cobol, Fortran, and Lisp for something like 50 years, and all are still used for current development (for new Fortran, check out many of the climate modelling, finite element, CFD, and numerical relativity codes).